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Questions tagged [extrinsic-parameters]

45 questions
18
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3 answers

Camera pose estimation (OpenCV PnP)

I am trying to get a global pose estimate from an image of four fiducials with known global positions using my webcam. I have checked many stackexchange questions and a few papers and I cannot seem to get a a correct solution. The position numbers I…
Gouda
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How to do perspective correction in Matlab from known Intrinsic and Extrinsic parameters?

I'm using Matlab for camera calibration using Jean- Yves Bouget's Camera Calibration Toolbox. I have all the camera parameters from the calibration procedure. When I use a new image not in the calibration set, I can get its transformation equation…
GMus
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14
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1 answer

Why Direct Linear Transformation (DLT) cannot give the optimal camera extrinsics?

I'm reading the source code of function solvePnP() in OpenCV, when the flags param uses default value SOLVEPNP_ITERATIVE, it's calling cvFindExtrinsicCameraParams2, in which it FIRST uses the DLT algorithm (if we have a non-planar set of 3D points)…
zhangxaochen
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How to plot the camera and image positions from camera calibration data?

I have the intrisic and extrinsic parameters of the camera. The extrinsic is a 4 x 4 matrix with rotation and translation. I have sample data as under, I have this one per camera image taken. 2.11e-001 -3.06e-001 -9.28e-001 7.89e-001 6.62e-001…
Kevin Boyd
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9
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3 answers

How to calculate extrinsic parameters of one camera relative to the second camera?

I have calibrated 2 cameras with respect to some world coordinate system. I know rotation matrix and translation vector for each of them relative to the world frame. From these matrices how to calculate rotation matrix and translation vector of one…
Karmar
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6
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1 answer

how to find 3d position of a point with intrinsic and extrinsic parameters with opencv

i want to find a position of a point with opencv. i calibrated two cameras using cvCalibrateCamera2. so i know both intrinsic and extrinsic parameters. I read that with a known intrinsic and extrinsic parameters, i can reconstruct 3d by…
cemal inanç
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6
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3 answers

Determine extrinsic camera with opencv to opengl with world space object

I'm using opencv and openframeworks (ie. opengl) to calculate a camera (world transform and projection matrixes) from an image (and later, several images for triangulation). For the purposes of opencv, the "floor plan" becomes the object (ie. the…
Soylent Graham
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4
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1 answer

OpenCV calibration parameters and a 3d point transformation from stereo cameras

I've 4 ps3eye cameras. And I've calibrated camera1 and camera2 using cvStereoCalibrate() function of OpenCV library using a chessboard pattern by finding the corners and passing their 3d coordinates into this function. Also I've calibrated camera2…
user991511
4
votes
1 answer

determine camera rotation and translation matrix from essential matrix

I am trying to extract rotation matrix and translation matrix from essential matrix. I took these answers as reference: Correct way to extract Translation from Essential Matrix through SVD Extract Translation and Rotation from Fundamental…
user4029119
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How to get camera intrinsics and extrinsics in openni2?

I have a primesense carmine 1.08 and carmine 1.09. I need the intrinsic parameters for the RGB and the IR camera and the extrinsics between the two. I use pcl with openni2 support. So I need to know the sensor parameters used by openni2/pcl. Is…
user27665
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Extrinsic camera calibration OpenCV

I am attempting to calibrate the extrinsics of four cameras that I have mounted on a set-up. They are pointing 90 degrees apart. I have already calibrated the intrinsic paramteres, and I am thinking of using an image of a calibration pattern to find…
NoShadowKick
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1 answer

Java Flyweight pattern: Extrinsic and Intrinsic states?

I am confused between the difference of these states for the Flyweight pattern. I am aware that intrinsic state is the state that is shared and that Extrinsic is not. However I do not see the importance that extrinsic state has within the pattern or…
user3287264
2
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1 answer

Substrate extrinsic complex (struct) types

I'm trying to use following struct in extrinsic parameter declaration: pub struct PriceUpdate { pub source_currency: Vec, pub target_currency: Vec, pub provider: Vec, pub price: i64, } And here's the extrinsic…
darnok
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1 answer

ReentrantLock threads terminating randomly

I have been working on a school assignment which is about multithreading in Java. One of the tasks that I am stuck on is that we need to create multiple threads in different groups, and once there are 4 threads in each group, only then they can be…
Naeem Khan
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Why OpenCV has only 6 extrinsic parameters in calibration function?

I use the Opencv sample code to do the camera calibration. As far as I know, the extrinsic parameter have 12 elements but in the OpenCV the sum of rotation vector and translation vector is 6. Why OpenCV has only 6 parameters…
Shih-Wei Ho
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